Control mechanism for pressing machines



March 13, 1945. o. H. I-L'EARIQO'N CONTROL MECHANI S M F'OR PRESSING MACHINES iiled Oct. 4, 1941 5 Sheets- Sheet 1 [III March 13, 1945.

o. H. PEARSON 2,371,466 O CONTROL MECHANISM FOR PRESSING MACHINES Filed Oct. 4, 1941 s Sheets-Sheet 2 March 13, 1945. PEARSQN' 2,371,466

, CONTROL MECHANISM FORPBESSING MACHINES 4 Filed Oct. 4, l fil 5 Sheets-Sheet 3 i w 63 Q 8/ 95 4/; m/,

March 13, 1945. O.-|- l. PEARSON CONTROL MECHANISM FOR PRESSING MACHINES- Filed Oct. 4, 1941 5 Sheets-She et 4 Zlrwwvbom 0/13 7 ear'ao17 Marh 13, 1945. o. H. PEARSON 2,371,466

- CONTROL MECHANISM FOR PRESSING MACHINES Filed Oct. 4, 1941 5 Sheets-Sheet 5 Patented Mar. 13, 1945 I GONTROL'MECHANISM MACHIN Otto'H. Pearson, Salt Lake City, Utah,

p t L. N. Strike, Salt Lake City, Utah I I I Application October 4,1941, Serial N". 4 13 "I 4 1 5Claims.' (01.38540) My invention relates to laundry presses and has for itsobject to provide a newand highly efilcient two hand controlled laundry press which is positive and sure in its action, which looks the movable buck in the closed position until releasedmanually 'or automatically and which'incorporates many new and improved features never before found in such types of presses.

A still further object is to provide anew sys-* tem of controlling the movable head-in which a two-hand control system is combined with" a diaphragm to operate an'over center toggle oper ating the mastervalve and the press and to. re-

lease the press by operating'the toggle in the opposite direction, by a diaphragm withmeans, in the path of travel of the toggle to hold itfrom passing over center until the movable head has engaged the stationary buck or asreg'ulated, to near the buck, depending upon the adjustment of the leverage. v

A still further object is to providea two'hand control for pressing machines which when actu' ated'operates a diaphragm, to shift a toggle; to operate a master valve, close the movable head;'

with the toggle held from passing over dead center until the operating machine of the press has reached a predetermined position at which time a barrier is removed from the path of the toggle and the head is locked in closed position.

A still further object is to provide'a'device as set out in the above objects in combination with an automatic release actuated by and due to the wear of the padding on the press and which will ".Figure 14 is roairnsssme ES I assignor system usedwith the timer forautomatically tirning the period ,Ifor holding the movable headengaging the pressing buck. v r

Figure '7 is a'diametrical sectioni of themercuryor-fiuid timercylinder. Y

valveused'in the timer-. v H

Figure- 9 is a side elevation of the pressshow vFigureSis a diametrical section of the'control f Y ingtheimethod of operating theibarrier'attached l0 to the operating toggleioi thepress. I

=1Figuie 10 is a side elevation of the small type press equipped inthe same manner. i Figure 1-1 shows a modified'mannerof ing thetoggle control. 1 r

a Figure 12 shows a view of the press withthe shaft lever attached to the leg of. the -crank operatm e'mberq' U Figure' lB. shows aimodific'ationlof Figure #11."

toggle.

Figure 15'- is an enlarged diagrammatic iew showingthe operation of the main: valve togg'le dotted"lines-indicating the position'of the toggle whenevercenter. 1. 'In'thedra'wings, I have shown my pres's'with a :movable: pressing head A', andystationary buck B. "TheEbuckB is mounted ona framework C andthe movable head is mounted on' one end of a pivotally mounted pressing arin' D. A toggleiE' operates the arm D and,head-;A-and a power cylinderIF provides the power for the press.

The cylinder]? is pivoted atone end by a pivot 4 and' is provided with a piston Son the endotrelease the press upon the tilting of the powercylinder or by other means which willrelease a control toggle by the action of the leverwhich controls the barrier again'throwing the toggle back to original position by the relative position of the lever and cylinder.

In the drawings,

the'relative position of the power Figure 1 is adiagrammatic vertical section of a press, parts shown in elevation, showing how my controls are mounted. L

- Figure 2 is a side elevation of a small type press, parts shown cut away,- to show theoperating mechanism.

Figure 3 is a diametrical section of the master valve. p 'Figure 4 is a diagrammatic view of the control system for the press showing the method of operating the toggle control for the master valve.

Figure 5 is a side elevation of the automatictimer device. 1

. Figure 6 is a diagrammatic view of the control aypiston' rod 6.1: The outer'end of the .rod 6' is attached to a leg 1.! I of a crank member 8' which in turn isattached to the toggle E at the juncture ofthe lower arm 9 andu'pper arm- I0. YAset of rollers Illis'mo'unted on the end-of the rod 6 adapted to-roll up an inclined pla'ne l2, thetop 40 of the plane being arc-shaped' at [3 with .the

' rollers-adapted to .follow the-face of the plane incline l2 and then. moveoverthe are 13 the final pressure being' a'pplled by the form of the crank member 8 Lwhich'is n'ot parto f this inventionlhaving been'covered in former'copending patent'applications;

Mounted at the frontofthetable H ore 1e press'are my. control members. .These' consist of spaced-manual buttons li 'and [6 for actuating the .presstand more closelyspaced release buttons l1 and 18. These buttons are'set'abov'e pivoted leverstL all of whichare alike and occur under all of the finger I tip control" buttons. The ease with whichrrthis; press is operated'is due to the, controlsthereof. The levers L are'pivoted in an i end view of the operating I suitable brackets [9 attached to the underside of the table H and in alignment with each lever there is one of my control valves. These valves are alike in form and shape, the only difference being in their sizes and as they are all alike I will describe the master valve only which is also like these valves, hereafter in this application.

These valves will for clarity be each given a diiferent number and each performs its required function. The two outer valves or control valves 2| and22 are attached in series. A pipe 23 leads fluid or air pressure from a source of supply until such time as the barrier 56 is Withdrawn (not shown) into the first valve 2| and through next valve 22. From the valve 22 another pipe- 25 leads to a toggle operating diaphragm 26."

These two valves are so conneted'that when the valve 2| is pressed the pressure will pass through the valve to the next valve 22 but unless the secondvalve-22. is pressed the airstops there. If thesecend. valve 22 is depressed simultaneously with the first valve 2| then the air actuates'the diaphragm2Soperating'the toggle lever 50 sufficiently to engage the arm 48 of the toggle T with the main control valve V sufiiciently toopen the valve for primary operation of the press. Thisnzisfully described hereinafter. This valve is mounted'through the flanged end of a mounting plate 28 securedpnto the topside of the lower cylinder F; The valve V'as shown in Figure 3 is made of a casing 29 having :a longitudinal bore therethroughihaving several diameters. A closure plug 21 is fitted into the end which-is termed the, pressure end in which the. pipe line 23 .is connected in the threaded hole 30; IA chamber 32 is formed in this end of the cylinder byua valve seatzpartitionfi'l. The chamber on the other side of. the "valv'e'partition shown as a chamber through a short nipple-into the interior of the pc ivver cylinder F;

The chamber'33 merges into a larger diame: tered exhaust chamber 34 inwhich an exhaust portr36: is bored todiseharge' air fromthe cylinderiafter :each .operation' thereof. In the end of thisphamber. 34'-there is a threaded guide plug 31: through which-an actuating rod 38 is passed. This rod .38 carries. a-spring held ball 38a in the endrthereofito. take :up wear: of :the valves. valve-H is carriedin the. chamber 32 for con-" trolling the pressure from the source 'of power and cneside-of .the valve is provided with an extended stem 39,. fitting illtOi a socketflflxin the plug, 21. for guiding the valve and a stem 43 isaextended-from theopposite side of. the "valve to control the valve; This valve is of larger diameter than the stem and normally is held seated-against the valve seat partition 3| "by a spring 42. The chamber 33.extend's ontlie other side of the valve 4| into the chamber 33; The main ,control valve 45 is of larger-diameter and fitsagainst the seat viorrned by they step of the larger diameter chamber 34? to the smaller operate the valve assembly. This larger stemis engagedby the rod 38.

A three-section toggle T is mounted so that one arm 48 :engages f the ball 38a. to actuate the valve assembly whenshifted by the mdvementbf the other two arms: 48 and 150. The "three :arms

i byreverse action of the to gle,

and toggle T snaps over dead center into valve retaining position. The toggle is therefore a valve latching element which will be latched when the pressure mechanism reaches a predetermined position, but if the mechanism travels past this position (as when the padding is worn) the toggle is again unlatched and the valve released. This releases the press and warns the operator that newpadding is needed. The master valve V .is so mounted in relation to the toggle T that it may be operated even though the barrier prevents. the toggle from overlooking. This is of course necessary in order to operate the press bringing the buck down to the head B operating the main toggle E by the movement of the cylinder- F and piston 5 and the movement of the cylinder F actuates the lever 54a for removing the barrier 56-.

A-stop barrier for the toggle is provided to keep it from passing over dead center until desired and consists oi;a vertically mounted, par

-tially rotatable crank rod 54 mounted in a cylin- A ball '56 .is movably carried in a recess inthe crank rod 5|! with one side of the ball extending to be engaged by the toggle arm 50 and prevent it moving further until the crank rod 54 has been partially rotated. A recess is formed in the rod 54 into which the ball 56 recedes when the rod has been partially rotated withdrawing the ball sufficiently .for the toggle to pass over dead center; When this happens the head is held in pressing relationship wit-hthe buck until released This is accomplished primarilyby a diaphragm 58 mounted on the opposite side-of the plate 28 with the shaft of the diaphragm adapted to press against the central toggle arm 49; this diaphragm from-a check valve coupling 5| which isconnected by 'two'pipes 62 and 63. The pipe -62 leads to one-release valve 64 and the pipe ,63 leads to the other release-valve 65. These arethe two release valves controlled by the finger control-led release buttons H and i8, and levers L' -arid are mounted behind and under these buttonsssimilar to the. way the other valves aremounted .togbe'gactuated by the buttons 1 5 and I6 and the controlvlevers L. v When the-release valves 64 and 65 are operated the air passing through the pipes 52, 53 and actuates the diaphragm whifiih in turn moves the .togglethrough the shaft 5 3 pressing againstthe'lever 49; The movement of the toggle over center releases the ivalve and thereby releases the press. pipe =61 connects the valve '64 with .the source of fluid pressure through a coupling on the top of the valve 2i and this source of power is also connected to the valve so that both valves are provided with air pressure or fluid pressure. Thus inthe arrangement shown in Figure itherelease valves may eitherone be utilizedfor releasing the press butinFigure'G the .va-lve 65 is shown for tan-dem purposes or in other words to release the next series' ofpresses'which may be setup in a A pipe (i0 leads tov s'e' mi circle around the operator. rer example thfeior four presses may be'set up'm a semicircle using a single operator toc'ontrol all 'of them and the release valve 65 on one press will release'the next press in the semicircle.

' The rotatable crank rod 54 has the crank end thereof attached to theframework by an ad justable link 54a so that any elevation or lowering of the free end of the power cylinder caused by the rollers passing up the incline 7 l2 will change the relative position of the crank rod'54; This oscillation or tilting movement is the means for permitting the toggle to' pass beyond'dead centeras the raising of the cylinder F causes the crank arm to partially rotate bringing the re-. cess therein into alignment with the ball 56 permitting it to recede therein which withdrawing from the path of the toggle permits it to pass beyond dead center thus the relative" movement of the cylinder F controls the position of the crank rod. a V

' Should the padding become worn, so that thepress when operating comes down too far, the rollers ll passing above the arc l3 will travel too far allowing the cylinder end to be-lowered after having been elevated for pressing action of the movable buck. This lowering of the free end of the cylinder F naturallyreverses .the movement of the crank rod-54 which changes the position of the recess therein causing the ball 56 to engage the lever arm 58 of the toggle instantly releasing the press by forcing the toggle back beyond dead center to itsinitial position exhausting the pressure from the cylinder F v by releasing the master valve V.

The adjustment of the link 54a and of thearm N of the toggle E control the position ofthe pressing or movable buck when this action takes place. I

To control the pressing head and automatically time the period for pressing I have provided a timer, which is shown in Figures 5 to 8'inclusive, and which timer regulates to any predetermined period the time for holding the head engaged with the buck.

The timer consists of anangle bracket 61 which is attached to the framework 0 of the machine and which bracket carries an extended bracket along the vertical side in the form of a letter L to the end of which a pressure diaphragm 68 is mounted. This diaphragm 68 is connected to the diaphragm 26 by a pipe H. A cylinder 13 is mounted to the base of the bracket 61 and carries a piston 14 which piston is provided with ports 15 and vent control nut 16 with the head of the cylinder closed and a plug is screwed into the open end of the cylinder with the piston rod 11 passing through the plug to engage an actuating lever 18. The cylinder is filled with mercury or other suitable fluid and the time required for the fluid to pass through the ports in the piston controls the time of drop of the piston. The end of the lever 16 is turned down and engaged by the rod of the diaphragm 68. The lever is pivoted at 19 for fulcrum pivot andpressure by the diaphragm raises the outer longer end of the lever raising the piston in the mercury. A spring 80 is mounted adjustably to the end of the lever 18 with the tension of the spring pulling the end of the lever downwardly causing the piston to settle through the mercury and the speed of lowering of the outer end of the lever is governed by the tension of the spring and the size of the ports in the piston. e

A valve 8| is mounted to the bracket 61 and the -stem 82 of the valve 83 is engage'd'by' an adjustable bolt 84 mounted through the lever-18' when it reaches a predeterminedjposition and the position is adjusted by'the predetermined time required or desired for holding the press closed. The valve may be of a type such as shown in Figure 3 or may be as shown in Figure 8 with the pipe leads into the lower chamber 93 of the valve 8|. The chamber above the valve seat is then connected through the check valve H to the'diaphragm 58 by a pipe 94.

- Figures 9 and 10 show the same general features as are found in the machines shown in Figures .1 and 2-with this difference. The rod'54a in'Figure 1 is shown in Figure 9 as a lost motion rod 54b andthe'rod is passed through a pivotal stop 80 mounted on the lower arm 9 of the 1208- gle mechanism and the rod- 54b is provided with an adjustable stop 8| to control the position for removal of the barrier when the press has reached.

a predetermined position. This same barrier removal feature is shown in Figure 10 as a rod 83 actuated by the movable toggle of this press shown in dotted lines as84.

This application'is a continuation in part of my co -pending patent application for control mechanism for pressing machines, filed September 16, 1940,'Se"rial Number 356,931, now'Patent NO.'2,332,830, dated October 26, 1943. i

In Figure 11 I have shown a modified marine of operating the toggle T'which consists of a cam 85fo'r'med on one end of a pivoted lever 81. The

base 8601? the lever shown in dotted lines is mounted rotatably in-the mounting plate 28 so that movement of the lever is accomplished by engaging a rod 88 to the end of the lever and with the end of the rod as mounted to the framework or to the toggle as shown in Figures 1.2, or 9 and 10. The cam or extended-end of the lever acts as a barrier for the toggle T engaging the toggle arm 50 holding it from passing over center until the cylinder has been tilted sufficient to move the lever 81 by the rod 88 out of the way of the arm 50, or until the movable toggle or operating mechanism of the press has moved suflicient distance to shift the rod 88. This also acts to release the press in the event that the padding is worn as continued movement of the toggleE of the press or excessive tilting of the cylinder F of the press will, when the lever 81 is made as in Figure 13 with-an additional cam, again release the press. When the lever is made with one cam continued movement will not release the press.

In Figure 12 I have shown a modification of my device in which the movement of the leg I of the crank member 8 is employed to release the press when the padding is worn. The crank member 8 is provided with a pivoted stop 89 through which the shift lever 88 or the lever 54a is passed. In this type of mounting, continued movement of the leg 1 or crank member 8 will again release the press by actuating the rod 88 and lever 81 which engages the lug 90 of the lever 81 with the lever-50 forcing it over dead e rner: and autometieellnre ea in the? valve v.

Hav ng I thu deseribed; m nvention; I; esire:

esee lre br. Letiers-Patentandclaims:

A entrolt r esses cemnrisine me e l he d and ta enarv bucka p rating, mecha m here f. aetuated ra row r r nder having: on

and eiveie ly mounted; spaced: va ves to; c ntrols-i he me a tog le mounted to. e on rolledbr: Rheumat c.mean gaqtuated b sa d sna ed vanes;

aid ve i con rol in meansrtounp r fl d to, aid ev r; alevermoun d d acent-said han a a ecess n o e a th reof a ball? a r e ase mount d on th cylinder wh ch ase he ever s mounted, a dball-beinss adap ed. to ,en a ain heg recess WhfiflxthEJQYEI-iSj eart al r qtaie ll o w th ew the hal ss; rier Q the path oieth toeelezme n onnect;

mg the tre o ter nd f he. le er: with th framework of the press so tkl@t:the ;-1Qwel' mg:QS- dilation, f he cyl nde wi l oause-thee r e art a ly: r tat d o; q ntro the arrier hall. peratehe} g nd re ease herpE S= A ont o or res es o automatically eoo-- thin, eom si a, a m vabl h ad and Star iona vbiiek; op a i g-in eh nismiorsa dc ov ble heed a ua ed b a! p voted.newer-cylinder nd; t asleme hanism; valve x which aid-press:

scontrolle o gle mounted t ns power, rz nde meansa tu i d; vw aid at er toggle-1 to eentr l e up y f per ting fluid to aideyl-vinder; a ball barrier mounted; in-the;path DIE-Sai to gle; a everfme ttesti the b ll: barrier Wit dra th l all ar ier om. the oa h: o the: oggle d m anscenneet na he ev r w ththe; rame rk. t herr ss e r thdraw the: barrier:

upon a p e e ermined amount ofsm ementt ndt n. on nuediv ting. f: hemwer cylinder to elease the/le al ndh b hem eb hu v.

3:. c ntrol for pr s es o. utomaticallv ee lease lle Press n. the; paddin h s he n-.. omoo h n: eemrrisina, amovame-headand s at on ambush; operating mechanism for said movable head} actuated; by a pivoted. power cylinder toggle mechanism; valves by which said press controlled; a toggle mounted on said power cylinder; means-actuated by saidlatter toggle to control the supply'of operating fluid to said. cylinder; a ball barrier mounted in the path ofsaid toggle; arecessed lever partially rotated by the pivoted power cylinder to withdraw theballbar rier, from the path of the toggle; andmeansconneoting theelever-with the, toggle mechanismof theress toswithdraw the barrier upon a-precle termined amount of movement.

4; Alcontrolfor presses to automatically: re

; lease the press rwhen the padding; has been worn:

too thin comprising, a movable head and; sta. tionary; buck; operating mechanism for said mov ableyheadactuated by, a pivoted power cylinder; and, toggle mechanism; valves by which said press;

;.;istcontro1le d; atoggle, mounted on said power cylinder; means actuated by said latter toggle tol' control the. supply of operating fluid tovsaid cylinder; a lever barrier mounted in the path of said tqg le; and means connecting the lever'withthe toggle-mechanism of thepressr to Withdraw."

1 wearing of the padding may-reach'apredetem' mined pressure applying position at which; the pressure diminishes; and. means to lock the head;

in-engaged; position lwithpthe bed member by the movement of the toggle mechanism, said means: being operative-in thelatter position of.=the toggleimeohanism 'toreturn the press to itsnfully; open position;

OTTO H. PEARSGNz; 

